openwrtv4/target/linux/brcm47xx/patches-3.10/082-MIPS-BCM47XX-add-EARLY_PRINTK_8250-support.patch
Hauke Mehrtens 4abd860ab2 brcm47xx: swap also early boot console if necessary.
Some devices are using tty1 as the default console, also swap the early
boot console in such case. This is needed for the WGT634U.

Thank you Russell for reporting this.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

SVN-Revision: 38794
2013-11-13 18:38:18 +00:00

100 lines
3 KiB
Diff

commit 22250a38f970c173acb1b3fb30e6dce1430f697b
Author: Hauke Mehrtens <hauke@hauke-m.de>
Date: Thu Sep 19 22:48:35 2013 +0200
MIPS: BCM47XX: add EARLY_PRINTK_8250 support
The BCM47xx SoCs have a 8250 serial compatible console at address
0x18000300 and an other at 0x18000400. On most devices 0x18000300 is
wired to some pins on the board, we should use that.
This is the smae for the AI (bcma) and the SB (ssb) bus, this is some
offset on the chip common core.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -117,6 +117,8 @@ config BCM47XX
select NO_EXCEPT_FILL
select SYS_SUPPORTS_32BIT_KERNEL
select SYS_SUPPORTS_LITTLE_ENDIAN
+ select SYS_HAS_EARLY_PRINTK
+ select EARLY_PRINTK_8250 if EARLY_PRINTK
help
Support for BCM47XX based boards
--- a/arch/mips/bcm47xx/prom.c
+++ b/arch/mips/bcm47xx/prom.c
@@ -28,6 +28,8 @@
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/spinlock.h>
+#include <linux/ssb/ssb_driver_chipcommon.h>
+#include <linux/ssb/ssb_regs.h>
#include <linux/smp.h>
#include <asm/bootinfo.h>
#include <bcm47xx.h>
@@ -94,9 +96,16 @@ static __init void prom_init_mem(void)
add_memory_region(0, mem, BOOT_MEM_RAM);
}
+/*
+ * This is the first serial on the chip common core, it is at this position
+ * for sb (ssb) and ai (bcma) bus.
+ */
+#define BCM47XX_SERIAL_ADDR (SSB_ENUM_BASE + SSB_CHIPCO_UART0_DATA)
+
void __init prom_init(void)
{
prom_init_mem();
+ setup_8250_early_printk_port(CKSEG1ADDR(BCM47XX_SERIAL_ADDR), 0, 0);
}
void __init prom_free_prom_memory(void)
--- a/arch/mips/bcm47xx/setup.c
+++ b/arch/mips/bcm47xx/setup.c
@@ -123,6 +123,28 @@ static int bcm47xx_get_invariants(struct
return 0;
}
+/*
+ * This is the second serial on the chip common core, it is at this position
+ * for sb (ssb) and ai (bcma) bus.
+ */
+#define BCM47XX_SERIAL1_ADDR (SSB_ENUM_BASE + SSB_CHIPCO_UART1_DATA)
+
+static void __init bcm47xx_swap_serial_ssb(struct ssb_mipscore *mcore)
+{
+ struct ssb_serial_port port;
+
+ printk(KERN_INFO "Swapping serial ports\n");
+
+ setup_8250_early_printk_port(CKSEG1ADDR(BCM47XX_SERIAL1_ADDR), 0, 0);
+
+ /* swap serial ports */
+ memcpy(&port, &mcore->serial_ports[0], sizeof(port));
+ memcpy(&mcore->serial_ports[0], &mcore->serial_ports[1], sizeof(port));
+ memcpy(&mcore->serial_ports[1], &port, sizeof(port));
+
+ printk(KERN_INFO "Serial port were Swapped\n");
+}
+
static void __init bcm47xx_register_ssb(void)
{
int err;
@@ -142,14 +164,7 @@ static void __init bcm47xx_register_ssb(
mcore = &bcm47xx_bus.ssb.mipscore;
if (bcm47xx_nvram_getenv("kernel_args", buf, sizeof(buf)) >= 0) {
if (strstr(buf, "console=ttyS1")) {
- struct ssb_serial_port port;
-
- printk(KERN_DEBUG "Swapping serial ports!\n");
- /* swap serial ports */
- memcpy(&port, &mcore->serial_ports[0], sizeof(port));
- memcpy(&mcore->serial_ports[0], &mcore->serial_ports[1],
- sizeof(port));
- memcpy(&mcore->serial_ports[1], &port, sizeof(port));
+ bcm47xx_swap_serial_ssb(mcore);
}
}
}